| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> |
| Cc: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Design of pg_stat_subscription_workers vs pgstats |
| Date: | 2022-02-15 16:26:02 |
| Message-ID: | 20220215162602.jclwnravu24mr7sx@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
Hi,
On 2022-02-03 14:35:10 +0900, Masahiko Sawada wrote:
> Yes, but if we use shmem IPC, we need to allocate shared memory for
> them based on the number of subscriptions, not logical replication
> workers (i.e., max_logical_replication_workers). So we cannot estimate
> memory in the beginning. Also, IIUC the number of subscriptions that
> are concurrently working is limited by max_replication_slots (see
> ReplicationStateCtl) but I think we need to remember the state of
> disabled subscriptions too.
Use dshash (i.e. dsm) with a small initial allocation in non-dynamic shared
memory...
Greetings,
Andres Freund
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